Rotary pump



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Nov. 24, 1925- 1,562,448 W. A. HATCHER ROTARY PUMP Filed Feb. 19 1921 3 Sheets-Sheet 5 Wm A? MC /76,

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WILLIAM A. HATCHEB, (ll? DETROIT, MIG

PUMP COJIJIPANY, 0L GRAND RAPIDS, 1M1...

Application. filed February 19, 1921. Serial No. (146,4.74.

To all 1072,0121 it may concern Be it known that I, l vrrua'ii A... l'ln'ronnn, a citizen of the United States residing at the city of Detroit, in the county of VV-ayn and State of hilichigan, have invented certain new and useful Improvements in Hotary Pumps, of which the following is a specification.

This invention relates to improvements in rotary pumps.

It relates particularly to improvements in the vane structure and also to improvements in the cylinder and rotary piston devices in a pump like that illustrated and claimed in my concurrent patent application SerialNo. 446,467, filed Feb. 19, 1921.

Objects which relate to details of structure and operation will fully appear from the detailed description to follow.

I accomplish the objects oi my invention by the devices and means described and illustrated in the following specification. The invention is clearly defined and pointed out in the claims.

A. structure which shows preferred embodiments of my invention is fully illustrated in the accompanying drawing forming a part of this specification, in which:

Fig. I is a detail side elevation view of my improved pump.

Fig. II is an enlarged detail transverse sectional view taken on a line 2-2 of Figs. I and III, showing the intake ports, piston and the discharge ports, in the cylinder.

Fig. III is a detail sectional view showing the improved vane in position, taken on a line corresponding to the irregular line 33 of Fig. II.

Fig. 1V is an enlarged detail transverse sectional view of the vane taken on a line l-t o1 Fl 's. II and III, showing details ct construction of the said vane.

Fig. V is a detail. sectional viewon line correspondin to the irregular line 55 of IL showing a modification of my improved vane adapted for use where the. DUE?! cylinder does not revolve. with special means tor maintaining the vane in sealed position.

Fig. VI is an enlarged detail sectional view of the modified vane taken on the irregular line 66 of Figs. V and VII.

Fig. VII is an enlarged detail sectional view of the vane and adjacent parts taken on line 77 of Fig. VIII,

Fig. VIII is a detail sectional view on line 8-8 of Figs. V and VII. Fig. IX is an enlarged detail horizontal sectional view taken on irregular line 9-9 of Fig. X. F ig. X is a detail sectional view taken on line 101O of Fig. IX, the head being removed and portions broken away to show details of the intake port in the piston and the dis charge port and passage in the cylinder.

In the drawing all the sectional views are taken looking in the direction of the little arrows at the ends of the section lines and similar numerals of reference refer to similar parts throughout the several views.

Considering the numbered parts of the drawing, 1 is the base having standards 2 and 3 at its ends. The standard 2 has a jour nal bearing box 4: at the upper end in which revolves the driving shaft 5. The standard 3 has a cap 6 at its upper end which holds the journalsupports 7 for the cylinder and piston securely in place. On this is carried the fixed end bracket 8 for the pump having discharge 8. 9 is the pump cylinder having the heads 10 and 12, with the discharge pas sa e 11 connecting to the discharge passage 18 on the head 12. 14 is the piston which is eccentrically disposed on the crank bear ing 15 which is carried on a shaft through the center of the cylinder. 16, 16 are the little cranks for maintaining the piston and cylinder in parallel relation. Oil ports 17 are provided for the crank-like supports 16.

The piston has a radial block portion in which is a radial recess 18 in which is disposed the vane 19. The vane19 is made up of a series of thin, rectangular metal plates 19', 19" which are perforated andslotted at 20 to receive an expanded spring 20. The holes are slightly ofl center so that the spring acts to expand the plates alternately in opposite directions. as shown in Fig. IV. As both the piston and cylinder revolve these plates are urged by centrifugal action into contact with the wall of the cylinder where they oscillate slightly backward and forward. As the plates are independently movable they each seat themselves forming an effective seal, insuring the efiiciency of the pump in a very simple manner.

When the vanes are applied to a pump the cylinder of which does not revolve it is necessary to provide transverseprojections 21 extending into the transverse recesses sealing.

" rial becomes necessary where the pump is used for compression purposes in order to withstand the heat. The bands should be effectively lubricated by graphite, oil or such lubricating material as the circumstances will permit, in order that the piston and cylinder shall move freely on each other. The purpose of the bands is to provide a yield ing contact for the curved surfaces between piston and cylinder to insure acomplete lVhile the two bands operate together in this way most effectively, it is clear that one band or the other may be omitted and the effect be secured to a corresponding extent.

The vane shown of course can be used in any piston having a radial slot but is of special consequence in the particular type of pump here shown, in which there is a slight to-and-fro movement. From these additional views it will be noted that there is an outer cylindrical case, and an inner eccentrically-supported cylindrlcal piston 14. which is maintained in. parallel relation by the rocker shafts 16 whereby the said piston rotates and is maintained in parallelism with the said cylinder whilst traveling around its inner periphery. This causes the vane 19 to have a relatively reciprocatory motion in the recess in the piston. An intake 11 is in the cylinder and a discharge opening 14; is in the piston on the opposite side of the vane 19 from the intake.

I desire to claim my invention specifically as illustrated, and also to claim the features broadly, as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a rotary pump the combination of a suitable cylinder, a cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the said cylinder and piston in said relative positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, means connecting the said piston and cylinder to maintain the same in parallel relation the one to the other during rotation, means for driving the same, a band of yielding material disposed within the periphery of said cylinder, the ends of which are connected each side of the exhaust, and a band of yielding material surrounding the said piston with its ends secured in proximity to the sides of said vane, coacting as specified.

2. In a rotary pump the combination of asuitable cylinder, a cylindrical piston of less diameter than the said cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the said cylinder and piston in said relative positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, means connecting the said piston and cylinder to maintain the same in parallel relation the one to the other during rotation, means for driving the same, and a band of yielding material disposed within the periphery of said cylinder, the ends of which are c0nnected each side of the exhaust, coacting as specified.

3. In a rotary pump the combination of a suitable cylinder, a cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the said cylinder and piston in said relative positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, means connecting the said piston and cylinder to maintain the same in parallel relation the one to the other during rotation, means for driving the same, and a band of yielding material surrounding the said, piston, with its ends secured in proximity to the sides of said vane, coacting as specified.

t. In a rotary pump the combination of a suitable rotary cylinder, a cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the said cylinder and piston in said relative positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, comprising alternating symmetrical lamin-ations of sheet metal with offset perforations, a spring in the said perforations to urge the symmetrical sheets in opposite directions, the same being free to be thrown radially outward in the said recess and contact with the wall of said cylinder by centrifugal force, means connecting the said piston and cylinder to maintain the same in parallel relation the one, to the other during rotation, and means for driving the same, as described.

5. In a rotary pump the; combination of a suitable rotary cylinder, a cylindrical piston of less diameter than said cylinder disposed eccentrically within the same to contact with the walls thereof, bearings for supporting the said cylinder and piston in said relative positions, a vane disposed in a recess in said piston and abutting the circumferential wall of said cylinder, comprising alternating symmetrical laminations of sheet metal with offset perforations, a spring in the said perforations to urge the symmetrical sheets in opposite directions, the same being free to be thrown radially outward in the said recess and to contact with the wall of said cylinder by centrifugal force, means connecting the said piston and cylinder to maintain the same in parallel relation the one to the other during rotation, means for driving the same, lugs at the opposite ends of said sheets at their radial inner sides or ends, and springs disposed under the said lugs to urge the said sheets radially outward, coacting as specified.

In witness whereof, I have hereunto set my hand and seal.

WILLIAM A. HATGHER. [L.S.] 

